Spindle feed mechanism



July 2, 1935. 1.. E. POOLE SPINDLE FEED MECHANISM 5' Sheets-Sheet 1 Original Filed May 28, 1929 ATTORNEYS July 2, 1935. E. POOLE 2,006,746

- SPINDLE FEED MECHANISM Original Filed May 28, 1929 5 Sheets-Sheet 2 ATTORNEYS BY AH -d. 4v

- INVENT I ,4 4. 224,

2 W 9; g ATTORNEYS Jul 2, 1935. E. POOLE SPINDLE FEED MECHANISM Original Filed May 28, 1929 5 Sheets-Sheet 4 y J'-m kl 441 I ATTORNE INVE TO %,,2/24.

July 2, 1935. L., E. POOLE 2,006,746

SPINDLE FEED MECHANISM Original Filed May 28, 1929 S'Sheets-Sheet 5 ATTORNEYS sink toward a wor UNITED Lora E. Poole, Anderson, assignments, to

Detroit, Mich., a corporation of Delaware STATES PATENT OFFICE 2,006,746 srmom FEED MECHANISM iginal application August 9, 384,715. Divided 1933, Serial No. 674,98 doned' application Serial 6 Claims.

This invention relates to' a metal working machine and in particular to a drill press head which is adapted tary tool such as from the work piece.

to automatically advance a roa drill, a reamer k piece and to retract the tool or a counter- This application is filed in place of my abandoned application Serial No. 1929 and is a division of my 366,672 filed May 28, co-pending application Serial No. 384,715 filed August 9, 1929.

An object of this invention is to adjust the tool carrier relative to the work piece. This has been accomplished by providing a pair of members one of which terminate portion and the other 5 in a frustro-conical having a recess with a frustro-conical inner surface, cooperating with the frustro-conical surface of said first member to hold the carrier in adjusted position and providing means for securing justed position.

Another object of this i the distance through which be adjusted. This has pin carried by one of the which travels in an said members in adnvention is to limit the tool carrier may been accomplished by a adjusting members arcuate slot in the other member. The relative movement of the two memhers is limited by the arcuate slot.

Further objects invention will be apparent description, reference panying drawings, wherein the embodiment of ly shown.

In the drawings: Fig. 1 is a side elevation o the pin engaging the ends of and advantages of the present from the following being had to the accoma preferred form of the present invention is clear- I the machine.

Fig. 2 is a sectional view taken on the line 2-2 of Figs. 4, 5, 6 and 7.

Fig. 3 is a fragmentary sectional view taken on the line 3--3 of Figs. 6 and Figs. 4, 5, 6 and '7 are sectional-views taken on the lines 4-4, 5-5, 6-6 and 1'I of Fig. 2.

Fig. 8 is a fragmentary sectional view taken on the line 8--8 of Fig. 6.

Fig. 9 is a fragmentary sectional view taken on the line 9-9 of Fig. '7.

In the drawings the ref erence character 20 indicates an electric motor mounted on the housing 2|, which forms a cap for the main frame 22. The gear 24 mounted on the armature shaft 26 meshes 'with a gear 28,

keyed to a tubular sleeve 30 and held in position by a collar 32 threadedly engaging the end of the tubular sleeve 30, which is journalled in th 33 and 35.

e end thrust bearings Ind., assignor, by mesne 1929, Serial No.

and this application June 9,

5. Also a reiile of aban-.

No. 366,672, May 28,

A spindle 34 is splined in the tubular member 36 and is journalled in the bearing 36. The spindle 34 terminates in a tool carrying end 38, which has not been shown in detail as any suitable tool carrier or chuck adapted to carry a tool, such as, a drill or a reamer may be used. Endwise movement of the spindle 34 relative to a quill 40 is prevented by a shoulder 42 integral with the spindle 34 and a nut 44 threadedly engaging the end 38, the shoulder and the nut abutting the inner race 36a of the roller bearing 36. The outer race 36b is held in position by a nut 31 engaging the flared end 4| of the quill 40. A key 48 seated' in the frame 22 cooperates with a slot 50 in the quill 46 which permits longitudinal movement and prevents rotary movement of the quill as may best be seen in Figs. 2 and '7.

A suitable mechanism for feeding the tool carrier or spindle 34 and the quill 40 longitudinally toward the work piece will now be described. The tubular sleeve 30 is provided with a worm 52 meshing with a worm gear 54, keyed to the shaft 56, which carries a spur gear 58 (see Figs. 2 and 5). The shaft 56 is journalled in bearings 60 and 62 mounted in the frame 22 and held in position by screws 64 and 66, respectively. The spur gear 58 meshes with a gear 68 (see Figs. 1 and 6), keyed to a tubular member 69 rotatably mounted on the shaft 10, journalled in bearings 12 and 16 which are mounted in the gear retaining cap 18 and the end frame 80, respectively, each of which are attached to the frame 22 by suitable screws. Intermediate the tubular member 69 and the shaft 10 is mounted a bushing 19. Member 69 terminates in radial teeth 82 which cooperates with teeth 84 integral with member 86 splined on the shaft 10 as best seen in Fig. 8. Also splined on the shaft 10 is a spiral cam I82 which cooperates with a cam follower 85 mounted on a pin 81 carried by a Z-shaped rack 88 and held in position by a set screw 89. As the cam I82 is rotated, the rack 88 will be urged to the left as viewed in Figs. 2 and 3, so as to feed the tool carrier or the spindle 34 towards the work piece through a driving connection consisting of a gear member 92 which is rotatably mounted on a shaft 94 meshing with the teeth 93 on the rack 88. The forces acting upon rack'88 are so directed that couples or turning movements are set up that tend to neutralize each other thereby reducing friction and the power required to actuate the rack. Gear 92 cooperates with a gear member I I2 splined to shaft 94 and meshing with teeth H3 provided therefor on the quill 40.

Gear 92 terminates in a frusto-conical surface i I part driven 92a cooperating with a recess in gear member I I2 having a, frustro-conical'inner surface to permit the adjustment of the distance of the work carrier from the workpiece. Members 92 and I I 2 are held in frictional engagement by a nut I26 threadedly engaging the end of the shaft 94 and bya shoulder I20 provided by a collar I 22 integral with the shaft 94. Upon the loosening of the nut I26 member I I2 is biased from member 92 by a helical spring I I8, mounted on the shaft 94 and positioned in a recess in member 92 provided therefor. The adjustment of the work carrier or spindle 34 is limited by a pin II4 carried by member II2 which travels in an arcuate slot H6 in member 92. As best seen in Fig. 2, gear members 92 and H2 ment by the length of the slot I I6 to such an extent that gear 92 in either end position of adjustment never demeshes from the rack I I3 under all circumstances. minates in a square portion I28 which permits the operator to adjust the spindle 34 without dismounting the machine.

The mechanism for retracting the work spindle 34 from the work piece comprises a spiral spring 98 which has a hooked end 96 engaging a recess provided therefor in a cylindrical portion I02, integral with gear 92 and the hooked end I03 engaging a recess in the cup shaped member I04 which is rotatably mounted in the end frame 80.

In order to adjust the tension of the spring 98 member I04 has been provided with a ratchet I05 which cooperates with a pawl I06 mounted on a pin I 08 carried by the end frame 80. Any suitable means such as a collar I 06a is mounted on pin I08 (see Fig. 7) to permit the manual withdrawal of pawl I06 from the ratchet I05 in case it is desired to decrease the tension of spring 98 as can be readily understood. The spring 98 urges the spindle 34 away from the work piece and the cam follower to the right as viewed in Fig. 2.

A device has been provided to stop the mechanism from reciprocating the spindle 34 after it has been retracted to the right as viewed in Fig. 2. This stopping device consists of a cam projection I30 integral with a member 86, which engages a releasing lever I32 mounted on the pivot I34 carried by the frame 22. In Figs. 6 and 8, it may be seen that as the cam projection I30 strikes the lever I32, member 86 will be biased against the force of the helicalspring I36 so as to disengage the radial teeth 82 and 64 whereby member 69 will rotate without rotating member 86 and the thereby. When the operator desires to have the spindle 34 reciprocated he presses inwardly on a rod I 39, pivotally connected to lever I32, against the action of a spring I40 so as to rotate the lever I32v in a counterclockwise direction as viewed in Fig. 2 whereby lever I32 clears the cam projection I30 permitting the spring I36 to actuate member 86 so that the teeth 82 and 84 will engage. If it is desired to use the drill press with an automatic work presenting device, suitable means may be provided to either hold lever I32 in such a position that it will at all times, clear the cam projection I30 or to automatically release lever I32 at the end of predetermined time inter- .vals or upon the happening of predetermined events.

A felt washer I50, which may be impregnated with oil, supplies oil to the end-thrust bearing 35, and is retained in position by the collar I5I, biased to the right, as viewed in Fig. 2, by a helical spring I52. bearing against an annular ring I69. held in the from 22.

are limited in their relative angular move- The end of the shaft 94 ter- Operation -A brief recapitulation of the mechanism and its operation will now be described as follows: The automatic drill head comprises a rotatable and longitudinally slidable tool carrier or spindle 34 carried in the frame 22 by means of the sleeve 30 and the quill 40, the sleeve 30 being rotatably mounted at one end of the frame and serving to rotate the spindle 34 which is' splined in this sleeve for slidable movement therein, and the quill 40 being slidably and non-rotatably mounted at the other end of the frame'and serving to advance and retract the spindle 34 to and from the work. Sleeve 30 is provided with the worm- 52 which meshes with a, worm gear 54 for actuating the feeding mechanism, which comprises a rotatable cam I82 contacting with a cam follower 85 secured to a rack 88 having a driving connection with the quill 40 through a pair of frictionally engaging members 92 and H2 adapted to permit the adjustment of the spindle 34 with respect to the work. The spring 98 retracts the slidable quill 40 and the spindle 34 at the end of each revolution of the spiralcam I82. Interposed between the worm gear 54 and. the spiral cam I82 is a clutch of which one element 86 carries a cam I30 which separates the two clutch elements 86 and 69 at the end of a retracting movement by contacting with a spring pressed lever I32 which is manually or otherwise controllable for permitting the two clutch elements to engage each other, the clutch elements being urged together by a spring I36.

Referring to Figs. 5, 6 and 7, the frame 22 has an extension I60 which is somewhat dove-tail shaped in cross section and which is adapted to slide between suitable ways provided by a machine frame, not shown, with which the drill head is intended to cooperate. It'will be understood by those skilled in this art that after the drill head has been moved along the ways of the machine frame it may be clamped in adjusted position.

While the form of embodiment of the present invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

What is claimed is as follows:

1. In a tool operating device, the combination of a housing'open at one side; a tool carrying spindle reciprocably supported by the housing and having a rack therein; a gear meshing with the rack and having a frustro-conical surface and a hub journaled in a wall of the housing opposite the open end thereof; an end frame detachably secured to the housing for closing the same; a bearing in the end frame; a shaft having a shoulder and being journaled at one end in said bearing and splined at the other end to the gear, said other shaft endextending beyond the gear and being threaded and terminating in a square portion to permit manual rotation of the shaft from the outside of the housing; another gear loosely mounted on the shaft and having a frustroconical surface adapted frictionally drivingly to engage that of the first mentioned gear; a spring between both gears normally urging the first mentioned gear out of driving engagement with said other gear; a nut received by the threaded shaft portion and engaging the first mentioned gear to force the same into driving engagement with said other gear and the latter into engagement meshing with said other gear for rotating the same.

2. In a tool operating device, the combination of a housing open at one end; a tool carrying spindle reciprocably supported by the housing and having a rack therein; a gear meshing with the rack and having a frustro-conical surface and a hub journaled in a wall of the housing opposite the open' end thereof; an end frame detachably secured to the housing for closing the same; a cup-shaped member journaled in the end frame; means for preventing rotation of the member in one direction; a bearing in the member; a'shaft having a shoulder and being journaled at one end in said bearing and splined at the other end to the gear, said other shaft end extending beyond said gear and terminating in a square portion to permit manual rotation of the shaft from the outside of the housing; another gear loosely mounted on the shaft and having a frustro conical surface adapted frictionally drivingly to engage that of the first mentionedgear; means cooperating with the shaft for forcing the first mentioned gear into driving engagement with said other gear and the latter into engagement with the shaft shoulder; a tensioned spiral spring secured with one end to the member and with the other end to said other gear and normally tending to rotate the latter in a direction opposite to said one direction; and a reciprocable rack meshing with said other gear for rotating the same.

3. In a tool operating device, the combination of a housing open at one side; a tool carrying spindle reciprocably supported by the housing and having a rack therein; a gear meshing with the rack and having a frustro-conicai surface and a hub journaled in a wall of the housing opposite the open end thereof; an end frame detachably secured to the housing for closing the same; end frame; means for preventing rotation of the member in one direction; a bearing in the member; a shaft having a shoulder and being journaled at one end in said bearing and splined at the other end to the gear, said other shaft end extending beyond the gear and being threaded and terminating in a square portion to permit manual rotation of the shaft from the outside of the housing; another gear loosely mounted on the'shaft and having a frustro-conical surface adapted frictionally drivingly to engage that of the first mentioned gear; a nut received by the threaded shaft portion and engaging the first mentioned gear to force the same into driving engagement with said other gear and the latter into engagement with the shaft shoulder;

a tensioned spiral spring secured with one end to the member and with the other end to said other gear and tending to rotate the latter in a direction opposite reciprocable rack meshing with said other gear for rotating the same.

4. In a tool operating device, the combination of a housing open at one side; a tool carrying spindle reciprocably supported by the housing and having a rack therein; a gear meshing with the rack and having a frustro-conical surface and a hub journaled in a wall of the housing opposite the open end thereof; an end frame detachably secured to the housing for closing the same; a cup-shaped member provided with a ratchet and having a hub journaled in the end frame and extendingto the outside of the closed housing to permit manual rotation of the mema cup-shaped member journaled in the to said one direction; and a' her therefrom; a pawl pivoted to the .end frame and cooperating with the ratchet to prevent rotation of the same in one direction; a bearing in the hub portion of the member; a shaft having a shoulder and being said bearing and splined at the other end to the gear, said other shaft end extending beyond the gear and being threaded and terminating in a square portion for permitting manual rotation of the shaft from the outside of the housing; another gear loosely mounted on the shaft and having a frustro-conical surface adapted frictionally drivingly to engage that of the first mentioned gear; a nut received by the threaded shaft portion and engaging the first mentioned gear to force the same into driving engagement with said other gear and the latter into engagement with journaled at one end in the shaft shoulder; a tensioned spiral spring setion opposite to said one direction; and a reciprocable rack meshing with said other gear for rotating the same.

5. In a tool operating device, the combination of a housing open at one side; atool carrying spindle reciprocably supported by the housing and having a rack therein; a gear meshing with the rack and having a frustro-conical surface and a hub journaled in a wall of the housing opposite the open end thereof; an end framedetachably secured to the housing for closing the same; a cup-shaped member provided with a ratchet and having a hub journaled in the end frame and extending housing to permit manual her therefrom; a bearing in the hub of the member; a shaft having a shoulder and being journaled at one end in said bearing and splined at the other end to the gear, said other shaft end extending beyond the gear and being threaded and terminating in a square portion to permit manual rotation of the shaft from the outside of the housing; another gear loosely mounted on the shaft and having a frustro-conical surface adapted frictionally drivingly to engage that of the first mentioned gear; a spring between both gears normally urging the first mentioned gear out of driving engagement with said other gear; a nut received by the threaded shaft portion and engaging the first mentioned gear to force the same into driving engagement with said other gear and the latter into engagement with the shaft shoulder; a tensioned spiral spring secured with one end to the oiip-shaped member rotation of the memand with its other end to said other gear and normally tending to rotate the latter in a direction opposite to said one direction; and a reciprocable rack meshing with said other gear for rotating the same.

6. In a tool operating device, the combination of a housing open at one side; a "tool carrying spindle reeiprocably supported by the housing and having a rack therein; a gear meshing with the rack and having a frustro-conical surface and a hub journaled in a wall of the housing opposite the open end thereof; an end frame detachably secured to the housing for closing the same; a cup-shaped member provided with a ratchet and having a hub journaled in the end frame and extending to the, outside of the closed housing to permit manual rotation of the member therefrom; a pin rotatably mounted in the end frame; a pawl mounted .on said pin and cooperating with the ratchet inside the housing to to the outside of the closed 1 permit manual rotation outside the closed housing for withdrawing the pawl from the ratchet; a bearing in the hub of 5 the member; a shaft having a shoulder and being journaled at one end in said bearing and splined at the other end to the gear, said other shaft end extending beyond the gear and being threaded and terminating in a square portion to of the shaft from the outside of the housing; another gear loosely mounted on the shaft and having a frustro-conical surface adapted'frictipnally drivingly to en-,

gage that of the first mentioned gear; a spring between both gears normally urging the first mentioned gear out of driving engagement with the other gear; a nut received by the threaded shaft portion and engaging the first mentioned gear to force the sameinto driving engagement with said other gear and the latter into engagement with the shaft shoulder; a tensioned spiral spring secured with one end to the cup-shaped member and with its other end to said other gear and normally tending to rotate the latter in a 1 direction opposite to said one direction; and a rack meshing with said other gear for rotating the same.

LORA E. POOLE. 

